Transformer core



June 3,1930. A, w, T OMPSN ET AL 1,760,998

TRANSFORMER CORE Filed June 23, 1926 vFly].

5 Z O Z lNvENToR. WHNESSE? firf/w/W Thompson 5% 4%,. M Fred J. l oyel Patented June. 3, 1930 UNITED STATES PATENT orri ARTHUR THOMPSON AND FRED J. VOGEL, OF SHARON, PENNSYLVANIA, ASSIGNOR S T WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORIPORATION OF PENNSYLVANIA Application filed June 28,

Our invention relates to electrical transformers and particularly to methods of mounting the windings thereof.

One object of our invention is to provide a transformer embodying pancake coils that shall have the coils uniformly spaced relative to the core member. a Q Another object of our invention is to provide spacing washers for transformer coils that shall space the coils both longitudinally 8f, and concentrically about, the ,core mem- In electrical transformers, it is desirable that spaces be provided between adjacent coils in order that the insulating oil may engage maximum radiating surfaces of the coils. For this purpose, insulating washers are provided with insulating blocks for spacing adjacent coils. The desired spacing of coils is usually provided by employing loose strips held in place by tape or by treatment with a binding substance. According to our invention, the insulating' washers and spacing blocks are fastened together to also provide means for centering the coils about the core, and do not require tape or treatment to make a good mechanical assembly. This may be done by either of two methods? First, the washers separating the coils and spacing blocks for centering the coils are all riveted together, or, second, the spacing blocks and washers are riveted and cemented together, and additional keys or spacers are inserted between the washers and a central insulating tube to center the coils. s In the accompanying drawings, Fig. 1 is a view, partially in elevation and partially in section, of a portion of atransformer embodying our invention.

Fig. 2 is a plan view taken along the section line 11-11 of Fig. 1.

A transformer core 1 .is provided with a tubular insulating member 2 that extends up- 'wardly along the legs of the core member 1 for preventing coils 3 from directly engaging the metal of the core member 1 and to provide ventilating assageways. The coils? are preferably of a at, pancake type and are sepa a ed from oneian h r by u ati g 1926. Serial No. 117,922.

washers 4 of annular form. Spacing blocks 5 are secured by riveting or cementing to the surfaces of the washers 4 and are preferably disposed equal distances apart. As shown, a washer 4 and four spacing blocks 5 are dispose'd between adjacent coils; The spaces between the spacing blocks 5 are filled with insulating fluid thereby presenting a considerable portion of the radiating surfaces ofthe coils 3 to the insulating oil.

' The inner ends of the spacing blocks 5 and .alined portions'of the surfaces of the washers 4 are provided with openings 6 in which keys 7 are inserted. The inner edges of the keys 7 bear against the outer surface of the tubular member 2. Keys 7 are of suihcient length toextend through their co-operating washers 4 and spacing blocks 5 and half the depth of each of the adjacent coils 3. The outer surfaces of the keys Z firmly engage the inner surfaces of the coils 3, thereby concentrically spacing the coils 3 from the tubular member 2. By reason of the presence of the keys 7,

the coils 3 are prevented from shifting relative to the tubular member 2 and the core 1 during transportation of the transformer.

In assembling the transformer, the core member 1' is built up, after which the tubular members 2 are placed about the legs thereof. The lower spacing washer 4 and the attached tubular'members 2. The lower coil 3 is then placed on top of the spacing blocks 5, after which the lower keys 7 are driven into the openings 6. The required number of spacing washers 4, coils 3 and keys 7 are then place on the legs inthe proper order. 7 Accordingly, we have provided a s acing and insulating washer for flat trans ormer spacing blocks 5 are then placed about the We claim as our invention:

1. In an electrical device, a tube, a plurality of coils surrounding the tube, spacing washers of insulating materlal disposed between the coils, and keys carried by the several washers, the keys cooperating with each washer extending into the spaces between thetube and the adjacent coils and engaging the keys co-operating with the adjacent washers.

2. In an electrical winding, a central tubular member, a plurality of pancake coils mounted along the tubular member, spacing washers disposed between adjacent 0011s, and keys cooperating with each washer, the keys extending into the spaces between the tubular member and the adjacent coils and engaging the keys on the adjacent spacing washers, whereby the coils are uniformly spaced from the tubular member.

' 3. In an electrical device, the combination with a tubular member and a pair of adjacent coils, of spacing means disposed therebetween comprising a washer, spacing blocks secured thereto and means co-operating with the spacing blocks and disposed to engage the inner surface of the coils and the outer surface of the tubular member for centering the coils with respect to the tubular member.

4. In an electrical device, a tube, a plurality of coils surrounding the tube, spacing members of insulating material disposed between the coils and having openings therein, keys extending through said openings for engaging the outer surface of the tubular memberand the inner surface of the coils adjacent to the spacing member.

5. In an electrical device, a tube, a plurality of coils surrounding the tube, spacing members of insulating material surrounding the tube between the coils and having openings therein, keys extending through said openings to engage the outer surface of the tubular member and having portions extending on opposite sides of a spacing member to engage the inner surfaces of adjacent coils.

6. In an electrical device, a tube, a plurality of coils surrounding the tube, spacing members of insulating material surrounding the tube between the coils and having notches in their inner edges, U-shape keys extending through said notches and along opposite sides of said spacing members to engage said tube, the inner surfaces of adjacent coils and the keys being associated with adjacent spacing members.

In testimony whereof, we have hereunto subscribed our names this 18th day of June,

ARTHUR W. THOMPSON. FRED J. 'VOGEL. 

